In SDE:L, monsters get the same bonuses for melee combat that Heroe's get: +1B for engaging an already engaged hero, and +1B for melee attacks against models suffering status effects.

In Arcade mode, we use the default values for monsters. How should the bonus dice be accounted for? just as a flat +1W for each criteria met above? That would seem like the most elegant solution, though a bit problematic for models such as kobolds that get +1W for engaged heroes already due to Mob, which would provide knuckleheads a default of 4W for attacks, and ironshields a default of 5W.